Adsorption of heavy metals in acid to alkaline environments by montmorillonite and Ca-montmorillonite

RETRACTED: Competitive sorption and selective sequence of Cu(II) and Ni(II) on montmorillonite: Batch, modeling, EPR and XAS studies

“…This result suggests that Cu(II) has a higher affinity for binding on montmorillonite. The selective order of Cu(II) > Ni(II) in this study is consistent with that reported in the previous studies (Reddad et al, 2002b;Kalmykova et al, 2008;de Pablo et al, 2011). An in-depth discussion is required to verify the influencing factors for the selective order of Cu(II) > Ni(II) for binding on montmorillonite.…”

Cu(II) and Zn(II) adsorption capacity of three different clay liner materials

“…Jung et al (2001) also showed that the adsorption of Cu(II) was through inner-sphere surface complexes at pH 5.9 in smectite-rich clay materials. In the case of Zn(II), however, adsorption on montmorillonites was previously attributed to pHindependent cation exchange with formation of outer-sphere complexes on permanent exchange sites and to pH-dependent surface complexation on amphoteric surface hydroxyl groups (Baeyens and Bradbury, 1997;de Pablo et al, 2011).…”

Comparison of the removal and adsorption mechanisms of cadmium and lead from aqueous solution by activated carbons prepared from Typha angustifolia and Salix matsudana

“…The initial solution pH is a key factor to determining adsorption capacity, and is greatly related to the surface charges and electricity of both adsorbent and adsorbate, including protonation or deprotonation of activated carbon and hydration, hydrolysis, and precipitation of metal ions. 22,24,[27][28][29] (Fig. 5b).…”